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Ecosystem

138 Questions Start Allen Test
All Exams Allen
Q126 Allen 4. ANALYTICAL QUESTIONS MCQ
In which of the following plant sunken stomata are found :-
A.
Nerium
B.
Hydrilla
C.
Mango
D.
Guava
Q127 Allen 4. ANALYTICAL QUESTIONS MCQ
An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will having :-
A.
High stability and low resilience
B.
Low stability and low resilience
C.
High stability and high resilience
D.
Low stability and high resilience
Q128 Allen 4. ANALYTICAL QUESTIONS MCQ
In which one of the following habitats does the diurnal temperature of soil surface vary most?
A.
Forest
B.
Desert
C.
Grassland
D.
Shrub land
Q129 Allen 4. ANALYTICAL QUESTIONS MCQ
Which of the following is not true for a species?
A.
Members of a species can interbreed
B.
Gene flow does not occur between the populations of a species
C.
Each species is reproductively isolated from every other species
D.
Variations occur among members of a species
Q130 Allen 4. ANALYTICAL QUESTIONS MCQ
Given below is one of the types of ecological pyramids. This type represents
A.
Pyramid of numbers in a grassland
B.
Pyramid of biomass in a fallow land
C.
Pyramid of biomass in a lake
D.
Energy pyramid in a spring
Q131 Allen 4. ANALYTICAL QUESTIONS MCQ
Consider the following statements concerning food chains :-
(a) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation.
(b) Removal of most of the carnivores resulted in an increased population of deers.
(c) The length of food chains is generally limited to 3-4 trophic levels due to energy loss.
(d) The length of food chains may very from 2 to 8 trophic levels.
Which two of the above statements are correct?
A.
a, d
B.
a, b
C.
b, c
D.
c, d
Q132 Allen 4. ANALYTICAL QUESTIONS MCQ
Which of the following representations shows the pyramid of numbers in a forest ecosystem: - image.png
A.
A
B.
B
C.
C
D.
D
Q133 Allen 4. ANALYTICAL QUESTIONS MCQ
Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct?
A.
Its base is broad
B.
It shows energy content of different trophic level organisms
C.
It is inverted in shape
D.
It is upright in shape
Q134 Allen 4. ANALYTICAL QUESTIONS MCQ
The upright pyramid of number is absent in
A.
Lake
B.
Grassland
C.
Pond
D.
Forest
Q135 Allen 4. ANALYTICAL QUESTIONS MCQ
Given below is an imaginary pyramid of numbers. What could be one of the possibilities about certain organisms at some of the different levels?
A.
Level one PP is "Pipal trees" and the level SC is "sheep"
B.
Level PC is "rats" and level SC is "cats"
C.
Level PC is "insects" and level SC is "small insectivorous birds
D.
Level PP is "Phytoplanktons" in sea and "Whale" on top level TC.
Q136 Allen 4. ANALYTICAL QUESTIONS MCQ
Identify the likely organisms (a), (b), (c) and (d) in the food web shown below :-
A.
rat, dog, tortoise, crow
B.
squirrel, cat, rat, pigeon
C.
deer, rabbit, frog, rat
D.
dog, squirrel, bat, deer
Q137 Allen 4. ANALYTICAL QUESTIONS MCQ
The rate of formation of new organic matter by rabbit in a grassland, is called :-
A.
Net primary productivity
B.
Gross primary productivity
C.
Net productivity
D.
Secondary productivity
Q138 Allen 4. ANALYTICAL QUESTIONS MCQ
Which one of the following processes during decomposition is correctly described?
A.
Leaching — Water soluble inorganic nutrients rise to the top layers of soil
B.
Fragmentation — Carried out by organisms such as earthworm
C.
Humification — Leads to the accumulation of a dark coloured substance humus which undergoes microbial action at a very fast rate
D.
Catabolism — Last step in the decomposition under fully anaerobic condition